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Anatomy- Muscles

skeletal muscle structure, sliding filament theory, cross-bridge cycling
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perimysium
connective tissue surrounding a fascicle
epimysium
connective tissue ensheathing the entire muscle
sarcomere
contractile unit of muscle
fiber
a muscle cell
endomysium
thin connective tissue investing each muscle cell
sarcolemma
plasma membrane of the muscle cell
myofibril
a long, filamentous organelle found within muscle cells that has a banded appearance
myofilament
actin- or myosin-containing structure
tendon
cord-like extension of connective tissue beyond the muscle, serving to attach it to the bone
fascicle
a discrete bundle of muscle cells
sarcoplasm
cytoplasm within a muscle fiber
fascia
sheet of fibrous connective tissue that encloses a muscle
aponeurosis
sheet of connective tissue by which certain muscles are attached to bone and fascia
myosin
thick filaments
actin
thin filaments
troponin/tropomyosin
two proteins associated with actin
sliding filament theory
when sarcomeres shorten, thick and thin filaments slide past each other, with think filaments moving toward the center of the sarcomere from both ends. H zones and I bands narrow, regions of overlap widen, and Z lines move closer together, shortening the sarcomere.
cross-bridge cycling
see book, pg. 294